2025.01.04

doc/CHANGES

@@ -15490,3 +15490,39 @@ abc2midi: corrections to the sus, sus4, sus2 and sus9 chords provided
 by Avik Topchyan were incorporated in the function setup_chordnames()
 into store.c
 
+
+January 3 2025
+abc2midi: it was recently discovered that abc2midi does not respect
+the microtone key signature when dealing with Turkish makams.
+In the sample file
+
+X:1
+T: Microtone key signature
+M: 4/4
+L: 1/4
+%%MIDI temperamentequal 53
+K: C
+B,2 D2|\
+_1B,2 _4D2|
+K: C _1B _4D
+B,2 D2|
+
+The last bar B,2 D2 should be played as _1B,2 _4D.
+
+Fix: most of the code dealing with the microtone key signature
+was already present in the function pitchof_b, however the
+implementation was not complete. In order to complete the
+implementation, the pitchof_b detects whether the note is
+under the influence of the key signature and invokes event_microtone()
+when necessary. The pitch shift is then applied just as if
+the microtone was already present in the note.
+
+Comment: the code dealing with microtones is very messy. The
+function pitchof_b is more than 120 lines of code because it
+also handles trills, and other note decorations. Information
+is passed around through global variables like workmic, workmap,
+note, pitchbend, microtone, setmicrotone. event_microtone
+is called before event_note. It is hard to determine what is
+going on. Many people have worked on this code.
+
+ 

doc/programming/eq53.txt

@@ -0,0 +1,54 @@
+This table may be useful when working with TET-53 abc files
+n = 1 pitch = 60 bentpitch = 7960 C
+n = 2 pitch = 60 bentpitch = 8888 ^1C
+n = 3 pitch = 60 bentpitch = 9815 ^2C
+n = 4 pitch = 61 bentpitch = 6646 ^3C
+n = 5 pitch = 61 bentpitch = 7574 ^4C
+n = 6 pitch = 61 bentpitch = 8501 _4D
+n = 7 pitch = 61 bentpitch = 9429 _3D
+n = 8 pitch = 62 bentpitch = 6260 _2D
+n = 9 pitch = 62 bentpitch = 7187 _1D
+n = 10 pitch = 62 bentpitch = 8115  D
+n = 11 pitch = 62 bentpitch = 9042 ^1D
+n = 12 pitch = 62 bentpitch = 9970 ^2D
+n = 13 pitch = 63 bentpitch = 6801 ^3D
+n = 14 pitch = 63 bentpitch = 7728 ^4D
+n = 15 pitch = 63 bentpitch = 8656 _3E
+n = 16 pitch = 63 bentpitch = 9583 _2E
+n = 17 pitch = 64 bentpitch = 6414 _1E
+n = 18 pitch = 64 bentpitch = 7342  E
+n = 19 pitch = 64 bentpitch = 8269 ^1E
+n = 20 pitch = 64 bentpitch = 9197 ^2E
+n = 21 pitch = 64 bentpitch = 10124 ^2E
+n = 22 pitch = 65 bentpitch = 6955 ^3E 
+n = 23 pitch = 65 bentpitch = 7883 F
+n = 24 pitch = 65 bentpitch = 8810 ^1F
+n = 25 pitch = 65 bentpitch = 9738 ^2F
+n = 26 pitch = 66 bentpitch = 6569 ^3F
+n = 27 pitch = 66 bentpitch = 7496 ^4F
+n = 28 pitch = 66 bentpitch = 8424 _4G
+n = 29 pitch = 66 bentpitch = 9351 _3G
+n = 30 pitch = 67 bentpitch = 6183 _2G
+n = 31 pitch = 67 bentpitch = 7110 _1G
+n = 32 pitch = 67 bentpitch = 8037 G
+n = 33 pitch = 67 bentpitch = 8965 ^1G
+n = 34 pitch = 67 bentpitch = 9892 ^2G
+n = 35 pitch = 68 bentpitch = 6724 ^3G
+n = 36 pitch = 69 bentpitch = 6337 _4A
+n = 37 pitch = 68 bentpitch = 7651 _3A
+n = 38 pitch = 68 bentpitch = 8578 _3A
+n = 39 pitch = 68 bentpitch = 9506 _2A
+n = 40 pitch = 69 bentpitch = 7265 _1A
+n = 41 pitch = 69 bentpitch = 8192 A
+n = 42 pitch = 69 bentpitch = 9119 ^1A
+n = 43 pitch = 69 bentpitch = 10047 ^2A
+n = 44 pitch = 70 bentpitch = 6878 ^3A
+n = 45 pitch = 70 bentpitch = 7806 ^4A
+n = 46 pitch = 70 bentpitch = 8733 _4B
+n = 47 pitch = 70 bentpitch = 9660 _3B
+n = 48 pitch = 71 bentpitch = 6492 _2B
+n = 49 pitch = 71 bentpitch = 7419 _1B
+n = 50 pitch = 71 bentpitch = 8347 B
+n = 51 pitch = 71 bentpitch = 9274 ^1B
+n = 52 pitch = 71 bentpitch = 10201 ^2B
+n = 53 pitch = 72 bentpitch = 7033 _1c